Bolt heading machine



p 20, 1932- L. ROBERTS 1,878,183

0. BOLT HEADING MACHINE gmemto'o L.L-HUEERT5.

. p 1932- L. L. ROBERTS 1,878,183

BOLT HEADING MACHINE Filed July 15, 1928 5 Sheets-Sheet 2 gwve'ntot L.L.FEEJEERTE- attic l nu;

Sept. 20, 1932. L, ROBERTS 1,878,183

BOLT HEADING MACHINE Filed July 13, 1928 5 Sheets-Sheet 3 ELIE- E 3 t L.L.ROEEF.TE

Sept. 20, 1932. 1 RQBERTS 1,878,183

BOLT HEADING MACHINE Filed July 13, 1928 5 Sheets-Sheet 4 gwuewtoo LLREJEEETE.

Sept. '20, 1932. 1.24.. ROBERTS 1,873,133

BOLT HEADING MACHINE Filed July 15, 1928 5 Sheets-Sheet 5 ELIE -5 L.L.H :EERTE Patented Sept. 20, 1932 r11 TE 1 sraras PATENT OFFICE "Louis L. menus, or DETROIT, MICHIGAN, ASST LG-NOR To PACKARD Moron can cor/r rAnY, or DETROIT, MICHIGAN, A conrona'rron or MICHIGAN chines.

BOLT HEADING MACHINE 1 Application filed July 13, 1928. Serial 110,292,845.

This invention relatesto bolt heading ma- An object of the invention is to provide'a bolt heading machinehaving a; movable work supporting head and indexing means for rotating the head for cooperation with a reciprocatory die moving normal to the path of movementof the head and in timed relation thereto.

Another object of theinvention is to provide a bolt headingmachine adapted to elecjtrically heat a work piece or stud so that a head may be formed thereomthe stud or work piece beingheld for a short interval of time in an electrical heating-circuit in which the stud itself forms part of the circuit and is electrically in series therewith.

A furtherobject of the invention is to pro vide a bolt heading machine in which heating or work piece internally and uniformly in a few seconds, so that when the work supportg ing head in which the workpiece is posi tioned is rotated at the end ofthe heating period and indeked for co-operation with a reciprocatorydie operating intimed relation thereto, an ideal upsetting condition prevails whereby a headis perfectly formed upon the stud.

. lVith these and other objectsin view which Y ingdrawings means for carrying the same i into practical, effect, without limiting the improvements in their useful application to f the particular construction, which for the,

@In the drawingsforming a specification: a

purpose of explanation, have beenmade the subject of illustration.

part of this elements co operate to heat one end of a stud Fig. l is a top plan View of the complete machine;

Fig. 2 is a front elevation; Fig. 3 is a side elevation;

' Fig. 1 is a cross sectional line 4.4 of Fig. 1, and

Fig. 5' is a diagram ofthe electrical circuit for the operation of the machine. 1

Referring to the drawings for more specific details of the invention, represents a suitable frame, and 11 a'table supported thereby. As shown, the table is provided "at one end with a bracket 12 having positioned thereon a motor 13 adapted to be connected to a source I of electrical energy with 'a suitable transformer 14, preferably of the water cooled type, interposed in the circuit, the transformer being supported in hangers 15 secured to the under side of the table. i

Journaled in suitable bearings 16, 17 and i 18, arranged transversely on the table is a crank shaft 19 and, mounted for rotation on the crank shaft 19, is a fly wheel 20 adapted to be locked to the shaft by a suitable clutch mechanism 21, the operating lever of which is indicated at the clutch being provided with a suitable brake 23 supported by a bracket or hanger 24 positioned on the top of the bearing 17 i The fly Wheel 20 has formed on its periphery a gear 25 in mesh with a driving gear 26 keyed on the. armature shaft of the, motor 13. Positioned on the frame in asuitablesuport 27 is a worm ear reduction unit COIIlprising a shaft 28 having formed thereon a worm gear 29 and a shaft 30 carrying a worm gear 31 in mesh with the worm gear 29. Keyed on the shaft 28 is a gear 32 inmesh with the gear25 on the periphery ofthe fly wheel, and keyed on the shaft 80 is a gear 33 in mesh with the gear 34 journaled on a suitable support 35. Positioned onthe table in spaced relation to. the support 35 are supports 36 and 37. These supports have arranged thereon aligneclbearings 88, 39 and 410 in which is journaled a drive shaft 41'positioned iongitudinally with respect to the table and normal to the shaft 19. This shaft has keyed'ther'eon a gear 42 in mesh with the gear s 3 1 and positioned on the end of'the shaft 41 in a oircle the center of which is the axis of the work. supporting head a plurality of bores 47 These bores areparallel with respect to eachfother and to the axis of the work supporting head and each has mounted therein awork supporting member 48 coin prising-a tubular section 49 provided with a head 50 seated flush against the face of the Work supporting head and a springactuated plunger 51 is mounted in each of the tubular sections 49. 2 i

On the back of the work supporting head is secured an index'plate orring 52 provided with n plurality orstuds or pins 53 arranged n spaced relation in a circle, the center oi which s the axis of thework supporting head 54 adaotable for en a ement b olun er 55 l a a l suitably "mounted on the bracket44 and no e mally held out of engagement with the notches 54 by anon spring 55 wlound upon the plunger.

Keyedon the shaft 41 is a sleeve 57 having formed thereon a radial flange. 58 in the, 'periphery; of which is positioned'a pin59' providing a suitablecam adapted toengage the pins 53 on the index plate to step around the work supporting head 46 upon each revolution. of the shaft 41. This sleevealso has formed thereon a cam 60 engaging a roller 61 journaled in one endofa rocker arm 62 pivoted on the support 44 and...provided inits other end with a su table tappet 63 engaging the plunger 55. As the work supportinghead 46' is stepped around in the manner hereinabove described, the plunger is actuated by the Gem and the rockerarm 62750 engage the -Shaped notch 54;

' the plunger 55 corresponding in oontourto the respective notches 54, the work support:

arapid rotation ofthe work supporting head or rotation beyondthe desired angle when the pins 53 areengaged by the pi; 59 a hired brake-64 is positioned'on thetable and provided with an adjustable shoe 65'engaging the periphery'of the work supporting head.

Positioned on the table is aguide GG having mounted therein a reciprocatorymember 67, connected by a suitable rod 68 to a crank 59 on the crank shaft'19j Thereciprocatory member .67 has a longitudinal bore 70 y and i a diametrical slot 71. 1 A die. 72 is threaded in the b'ore'ZO and positioned to, register with the respective Work supporting members 48.

Because of the conical or V-shaped end on Thedie has an axial bore in which is pos'i- V tioned a spring retracted plunger'73 adapted. to engagefa pin 74positione'd 1n the slot 71 so that upon reverse orbackward stroke of the reciprocatory memberthe Work piece 75 is ejected from the die. 1 V

Positioned on a suitable support 76 is an electrode 7? preferably waterjacketed; As

shown theelectrode 77 has two correspond.

ing members pivoted'togethen on the support 46 as mdlcated at 'r 8 to provlde clamp1ng aws -79o1"tset as at 80 to straddle the work pieces The clamping aws of the electrode .moved toopen and closedxpositionby arms "82 connected by a'. toggle 88 having pivoted and arranged radially on the race of the pla e between each pair of pins 15 a V-shaped notch thereto a rod 84 provided with a longitudinal slot 85 which receives the driving shaft 41. The 'rod 84 has formed thereupon an arouate lug 86 engaging a cam 87 carried by the shaft 41.. The arcuate lug on the rod is pressed in engagement with the cam :on the definite period'ot time requisite for the proper heating thereof." The ourrent'necessary for heat ng the studis. conveyed to the respectlve arms of the electrode bymeans of secondary bands suitably connected to the transformer,

the bands being more or less flexible to permittree movement ot'the clamping jaws 1n the manner above described.

Arranged to oooperate with the electrode 77 is an electrode 89 also preferably water cooled. "As shown," theelectrode 89 is posi tioned in the'end of an arm 90*pivoted as indicated a't'91 and provided upon its other end with a'roller 92 engaging a cam 93 keyed The electrode 189 is secured to the shaft 41. to a primaryband '94 leading to and suitably connected to the transformer. By means of i this structural arrangement the electrodes 77 and 89 co-operate with one another in timedQ relation for the proper aheating of the'st'ud' or work piece.- F I i 1 1 have showna diagramof a cir In Fig. 5, I curt for the operation otthe machinewherem suitable: current is conducted through I indicated at 95 connected to terminals 96'of a threeblade switch 97 the" other terminals 98 of which are connected-by lines99 to the .motor liiwith a suitable motor starting switch 100 and a service"switch,;not" shown, interposed in the line. Connected totwo of the ill:

masses terminals 98 of the switch 96 are lines 101 leading to the transformer 14 with a suitable relay switch 102. and a rheostat 103 interposed. The relay switch 102 is operated through an auxiliary switch 104 actuated by a timing gear 105 keyedon the shaft 41, and the transformer is suitably connected as by the secondary and primary bands 107 and 94 32 keyed on one shaft of a reduction unit, the i other shaft of which haskeyed thereon agear 33 in mesh with a gear 34 meshlng with a gear42 keyed on thedriving shaft 41.

This train of gearing is such that thedriv ing shaft 41 rotates at a rate considerably less than the rate of, the fly wheel. In praction of approximately 33 to 1 produces the on the driveshaft toengage one of the V- porting head in a fixed position fora definite for a definite period of time.

desired result. As the shaft41 rotates, the pin .59 carried by the drive shaft, engages one it of the pins 53 in the work supporting head 46 whereupon the head is rotatedto a position substantially opposite the 1 spring retracted plunger 5 51 The plunger is actuated by the rocker arm 62 operated by thecam 60 shaped notches in the index plate carried by the head to index and retain the work supperiod of time. i As: the work supporting head is moved to indexedposition the electrodes 77 and 89 automatically engage the work piece to complete the circuit and to heatthe work piece This is accomplished by means of the cam 87 on the i driving shaft actuating the electrode 77 to clamp the body of the work piece or stud, and a cam 93 alsoon the driving. shaft Wl11Cl1 causes the electrode 89 to contact with the end of the Work piece or stud upon which the head is formed.

Theelectrodes are retained in engagement -with the stud fora predeterminedperiod of time, suflicient to properly heat the stud. whereupon the cams break the contacts between the electrodes and the stud, and simultaneously the auxiliaryswitch 104 operated by the cam 105 on the shaft 41 breaks the circuitleading to the transformer, and the work supporting head is stepped around in 41 actuates the trip lever 22 ofthe clutch mechanism .21 which looks the fly wheel 25 to the shaft 19 and causes the shaft to make one revolution whereby the reciprocatory nlemb er 67 is moved forwardly to press the die carried thereby with great force on the heated end of the stud to form the head thereon, in ward movement of the stud in the work sup porting member being limited by the spring actuated plunger 51. r

As the die presses theheatedend of the stud to form a head thereon, the headso formed binds in the die sufficiently tight toextract the work piece from the work supporting member 48 and as the reciprocatory member 6'1 moves in reverse stroke the springretracted plunger positioned in the axis of the die isjcaused to engage the stop 74 causing the plungerto ejectthe stud or work piece from the die whereupon the work piece drops 2 ina suitableconveyor 106 through which it passesfrom the machine. Although thisinventlon has been described l v j in connection with certain specific emboditice it has been found that a relatlve reducmen-ts, the principles involved are susceptible to numerous other applications that will readiiy occur ;to persons skilled in the art. a

The invention is, therefore, to be limited only as indicated by the scope of the appended claims. j ;-Hav1ng thus described the various features of my invention, what I desire to secure byLetters Patent, is: i r u 1. In a'machine for heating and forging metal blanks having a rotary blank support ting head and a drive shaft connected to rotate the head intermittently, an electrical heating dev ce for sald blankscomprismg jawsassociated to engage theblanks carried by the head, said jaws constituting a sec- I ondary electrode, means driven by the drive shaft and connected to the jaws to open and close them intermittently, a pin constituting a primary electrode connected to the drive shaftin a manner to be movable toward and away fromsaldhead, and means connectlng a the electrodesto asource of electrical current, said electrodesbeing timed to contact one of said blanks at the same time and between the intermittent movements of the rotary head to make an electriccircuit through said blank for heating it to forging temperature.

2. In a machine for heating and forging metal blanks having a rotary blank supporting head and a cam drive shaft connected to intermittently rotate the head, an electrical heating device for said blanks comprising pivoted aws associated to engage the blanks carried by the head, said jaws constituting a secondary electrode, a toggle connected to open andclose said jaws, a rod having an arcuate lug thereon engageable with one of the cams on the. drive shaft and connected toactuate the toggle, a spring associated with i the rod and yieldingly holding it in engage pin being connected to one of the cams of thedrive shaft and" associated to bemoved t0 Ward and away from said head, and means connecting said electrodes to a source of electrical; current, i said electrode operating mechanism being timed so that said electrodes contact a blank at the-same time and between;

the intermittent movements of the rotary head rto make an electric circuit through said 7 i blank for heating-it to forgingtemperature.

3. In a machine for heating and forging metal blanks having a rotary. blank supporting head and a drive shaft therefor, an elec- V trica-l heating device for said blanks comprising jaws associated to engage the blanks car- 7 ried by the head, said jaws constituting a secondary electrode, means connected with the drive shaft and to the jaws to open and close said jaws intermittently, a pin constituting a primary electrode, a pivoted arm connected to move the pin toward and away from the head, cam means associatedwvith the drlv'e shaft to intermittently actuate the arm, and

a roller on one end of the arm engageable with said cam means. V a a V 4. In a machine-for heating and forging metalbla'nks having a rotaryblank support ing head and a cam drive shaft associated it i to intermittently rotatethe head, an electrical able with one of the cams on the driveshaft,

heating device for saidblanks comprising pivoted jaws. associated to engage the blanks carried by saidhead, said jaws constituting asecondary electrode, a toggle connected to Open and close said aws, a rod connected wlth v the toggle and-.havinga lug thereon engage;

a spring associated with the rod and yield: ingly holdlng 1t 1n engagement with said cam,

- said mechanism being associated to operate the aws intermittently, a p n constitutlng a prlmary electrode, a pivoted arm connected to .move the pin toward and away iroml the head, a roller on one end ofthe arm engaging another ofthe cams of the drive shaft to actuate said arm and said electrode pin, and

means connecting said electrodes to a source of current, said electrode:operatingniechanism being timed so that the electrodes contact a blankat the same time 'andbetween the a intermittent movements of i the rotary head to make an electric circuit through said blank for heating it to forgmgtemperature.

V In testimony-whereof I affix my si ature;

LOUIS ROBERTS. 

